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Nutrient Interactions and Toxicity

Detrimental Effects of a High Fat Diet in Early Renal Injury Are Ameliorated by Fish Oil in Han:SPRD-cy Rats^1,2

Jing Lu³, Neda Bankovic-Calic^*, Malcolm Ogborn^*, M. Hossein Saboorian and Harold M. Aukema^**4

Departments of Nutrition and Food Sciences, Texas Woman’s University, Denton, TX 76383; ^* Pediatrics and Child Health, University of Manitoba, Winnipeg, MB, R3T 2N2 Canada; Surgical Pathology, University of Texas Southwestern Medical School, Dallas, TX 75235; and ^** Department of Human Nutritional Sciences, University of Manitoba, Winnipeg, MB, R3T 2N2 Canada

⁴To whom correspondence should be addressed. E-mail: aukema{at}umanitoba.ca.

Dietary fish oils containing (n-3) fatty acids can modulate renal inflammatory injury. We previously demonstrated that a high fat (HF) diet worsens early renal disease progression in the Han:SPRD-cy rat model of polycystic kidney disease (PKD). Therefore, using HF (20 g/100 g diet) and low fat (LF; 5 g/100 g diet) diets, we compared the effects of menhaden oil (MO), soybean oil (SO) and cottonseed oil (CO) on renal function and histology in male Han:SPRD-cy rats fed the diets for 6 wk in the early stages of renal disease. Overall, rats fed HF compared with those fed LF diets had larger kidneys, more renal fibrosis and lower creatinine clearance (main effects of fat level).Rats fed MO rather than CO and SO diets had significantly lower kidney weights, kidney water content, cyst volumes and serum cholesterol and triglyceride concentrations (main effects of fat type). Rats fed MO diets also had less renal fibrosis than those fed CO diets, but the least fibrosis was in rats fed SO diets. Analysis of simple effects (due to interactions between fat level and type) revealed that HF diets increased renal inflammation in rats fed CO diets, but reduced inflammation was present in those fed SO and MO diets; HF diets also increased compared with LF diets serum urea nitrogen concentrations in rats fed the MO and CO diets, but not the SO diet. These results confirm that high dietary fat worsens early disease progression in this model of renal disease, and further demonstrate that diets with oils containing (n-3) fatty acids ameliorate some of the detrimental effects of a high fat diet.

KEY WORDS: • dietary fat level • fish oil • early renal disease • rats

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